Free tutorial support via phone, fax, or email staffed by developmental math faculty. The Prentice Hall Math Tutor Center is available Sunday through Thursday from 5:00 PM (EST) to midnight five days a week for seven hours a day. The PH Math Tutor Center is accessed through a registration number that may be bundled with a new text or purchased separately with a used book. The PH Math Tutor Center comes automatically within MyMathLab.